Benchmark: push vs spread (while)

Script Preparation code:

var subarrs = [
 [ "hello", true, 7 ],
 [ "yes", "no", "maybe", false, 27 ],
 [ 16, "I", "wonder", "what", "will", "be", "fastest"]
];

Tests:

while spread
var other = [ 1, 2, 3 ] var len = subarrs.length while (len--){ other = [ ...other, ...subarrs[i] ] } return other;
while push
var other = [ 1, 2, 3 ] var len = subarrs.length while (len--){ var lenj = subarrs[len].length while (lenj--){ other.push(subarrs[len][lenj]) } } return other;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
while spread
while push

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net!

The provided JSON represents a benchmark that compares two approaches: using the spread operator (`...`) and using the `push` method to concatenate arrays in a while loop.

**What is tested?**

In this benchmark, we have two test cases:

1. "while push": This test case uses a while loop to iterate over an array `subarrs` and pushes each element of the subarray onto another array `other`. The loop continues until all elements from `subarrs` are pushed onto `other`.
2. "while spread": This test case also iterates over `subarrs` but uses the spread operator (`...`) to concatenate elements onto `other`. Again, the loop continues until all elements are concatenated.

**Options compared**

The benchmark compares two options:

1. Using the spread operator (`...`) to concatenate arrays.
2. Using the `push` method to concatenate arrays in a while loop.

**Pros and Cons of each approach:**

1. **Spread Operator (`...`)**
	* Pros:
		+ More concise and expressive way to create new arrays by spreading elements from an existing array or iterable.
		+ Can lead to more efficient execution, as the spread operator can bypass some intermediate steps in the JavaScript engine.
	* Cons:
		+ May incur a small overhead due to the need to create new arrays using the `Array.from()` method (in older browsers).
2. **Push Method**
	* Pros:
		+ Well-established and widely supported syntax for concatenating arrays.
	* Cons:
		+ Can lead to more overhead, as each push operation creates a new array object, which may not be optimal in terms of memory allocation and garbage collection.

**Library**

There is no explicit library mentioned in the benchmark. However, it's worth noting that some libraries like Lodash or other utility libraries might provide similar functionality for array manipulation, such as `_.concat()` or `_.spread()`. But in this case, we're comparing the built-in JavaScript spread operator and push method.

**Special JS Feature**

There is no special JS feature mentioned in this benchmark. The code only uses standard JavaScript syntax.

Now, let's look at the benchmark result:

The results show that the "while spread" approach outperforms the "while push" approach. This might be due to the more efficient execution of the spread operator or other factors not immediately apparent from the benchmark setup.

**Other alternatives**

If you're interested in exploring alternative approaches, consider the following options:

1. `concat()`: You can use the `Array.prototype.concat()` method instead of the spread operator for concatenation.
2. `slice()` and `push()`: Another approach would be to use `slice()` to extract elements from the subarray and then push them onto another array using `push()`.
3. Other libraries or frameworks: Depending on your specific use case, you might find that a library like Lodash or another utility library provides an optimized solution for array concatenation.

I hope this explanation has helped you understand the benchmark and the trade-offs between these two approaches!

Related benchmarks:

push vs spread (while) (version: 0)

Comparing performance of: while spread vs while push

Created: 4 years ago by: Guest

Jump to the latest result

while spread

while push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):